Zac Efron and Dwayne “The Rock” Johnson have become fast friends behind-the-scenes while filming Baywatch, but there’s a bit of BFF rivalry going on in the gym!

The 28-year-old actor dished to Men’s Fitness that he’s working toward getting as “jacked” as his co-star and has been training so hard, he’s in the best shape of his life!

“Right now I’m probably the physically strongest I’ve ever felt,” he said. “Not in terms of bench press or how much I can squat, but in how quickly I could get out of this room and destroy everything in my path.”

The Neighbors 2: Sorority Rising star said he reached an impressive 5 percent body fat and revealed exactly how he’s stuck to his outrageous diet plan in the magazine, which hits newsstands on May 23.

“Zac committed to be the best version of himself possible and did it,” The Rock told the magazine. “He’s reached nirvana—muscle nirvana.”

The June cover star showed off his intensely sculpted biceps in a tight t-shirt, though his latest role, infamous for swim trunks and Speedos, certainly doesn’t require covering up!

“Zac’s had to apply the diet and training strategy of an elite athlete, but he’s also had the ‘added bonus’ of needing to maintain that look for months while we’re shooting,” he added.

Now that’s commitment!

For details about Efron’s workout and his exact diet and nutrition plan, pick up Men’s Fitness, on newsstands May 23!